Hi guys, I have a newbie question. I have a NeilPryde 430 75% carbon, probably 4/5 years old. I got two of them for a silly price (less than 100 bucks).
I have an Ezzy Freeride 5 2011 5.5 mt which requires an RDM 430 with a downhaul of 440 at max. If I try to downhaul my SDM to 440, the Ezzy doesn't get the right shape yet. I notice that I should go down to 446 or 448. Unfortunately with one of these old SDM, I downhauled to 442 and it broken!

The second one went down to 446 but I believe it is not enough yet, the battens are still behind the mast and the curve of the sail is not tight to the mast yet.
Now I am scared with the second one so I am wondering to know, what should be the maxim luff for a 430 SDM 75%? The model is a C75, which is not available anymore in NeilPryde catalog.
Just wondering, as anyway, I ordered already an RDM Ezzy 430, but in the meantime, here is blowing between 20-25 in these days and
I wanna get out in the water! 